The longest running radio show and the biggest online social network are joining forces.

The Grand Ole Opry and MySpace are uniting to stream a live video Opry performance from the venerable stage for the first time on Saturday night.

Hard on the heels of her co-hosting duties at the CMA Awards Wednesday, Carrie Underwood will be part of the old school/new school collaboration.

Underwood, Martina McBride, Rodney Atkins, Jake Owen and other performers will perform between 9 p.m. and 10 p.m. EST. 

LIVESTREAM: See the Opry performance at MySpace.com's music page on Saturday at 9 p.m. Eastern Standard Time.

Underwood will perform music from her just-released CD "Play On," including the hit "Cowboy Casanova."

The Opry, on the air since 1925, bills itself as the world's longest-running radio show. It can be heard on opry.com.